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AN-RAX
After
the introduction of V 5.2 protocol, we are able to provide better service
in the very rural areas of our country. Access network is a new design
developed by C-DOT for the inter working of C_DOT 256 RAX exchanges. This
way we eliminate one node in the switching network and call processing
efficiency is improved, and net result our call success rate is improved.
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The
local exchange can be of any switch (EWSD, OCB, 5ESS, or C-DOT).
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The
Local Exchange should support V5.2 protocol.
This
is being developed by C-DOT and this AN-RAX is working fine with all other
types of Local Exchanges other than C-DOT Switches. In C-DOT switches
2_2_1_6 software is to be installed for having 14 links in a VU BM. We
are facing one or two minor problems in the maintenance of these AN-RAX.
Though
the technology is same, multiple venders are supplying the equipments
and at times certain hardware compatibility problem and timing problems
occur which causes instability.
CDOT has come out with
a better solution in 2_2_1_6 7.7 software and the AN-RAX are functioning
beautifully.
Here are some tips for the better working of the AN-RAX
with C-DOT switches.
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Release13
version EPROMs are available for ARC CARDS in the AN-RAX. Prom location
in U2 and U20 are to be up graded.
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A
Trunk BM should be dedicated for VU working only in the Local Exchange.
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7
AN links in case of 2_2_1_4 and 14 links in case of 2_2_1_6 s/w release
is possible and the spare DTKs in the VU BM need not be equipped.
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MFC
Card: If HMS card is used in the TS mother board, a ECN should be
done in the AFB card, and then all the 4 MFC cards can be equipped
in the BM. If MSC/MSD cards are used in the TS mother board equip
only 3 MFC cards in the VU BM.
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Create
all ‘dtmf’ circuits in the MFC cards and create all the subscribers
in the AN-RAX as ‘dtmf’ subs and convert all the instruments in the
subs premises for tone working.
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Check
the jumper setting at IFC card (SSM, ESL,PSM,ESM)
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Use
only SPC cards in the AN-RAX. It is not advised not to have ISP cards
in the AN-RAX.
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The
DTK at 21st slot of ti13 in the VU BM should not be used
and kept spare only.
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These are my practical observations, and felt in the field.
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